[R-390] Insta-Foam

[William A Kulze]

I experienced similar things with it. I did see some Great Stuff a couple weeks ago that has lower pressure expansion and is intended for window and door casements. Blue can instead of red, I think. Learned the hard way that you only want to fill the space about 1/3 or so when spraying. Boy, didi I do a lot of trimming!

Bill W2NVD

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Tisha Hayes
Sent: Wednesday, January 05, 2011 12:23 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Insta-Foam

I learned a tough lesson with "Great Stuff". Do not try to use it as a gap
filler around window frames where there is not much room for it to expand. I
used it and it blew the drywall off the wall with the force as it expanded
and cured. It also warped the window frames and made it difficult to open
the windows.

It is great for really tiny applications like plugging the gap around a
piece of conduit that you are using as a wall penetration for a coax cable.

The mix and pour type packing foams are safer to use (will not blow the
cardboard box apart). I did not know about UPS as being a source. I think
the "closed cell" SPF type material used in building insulation also OK. Be
careful of the "open cell" materials.
-- 
Ms. Tisha Hayes/ AA4HA
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